The risk identification of unconventional crisis is one of the core scientific problems of the emergency management． Due to the current situation of frequently facing a baseless simulation in academic study and practical application，risk identification has become a difficult issue that needs to be addressed as a matter of urgency． By integrating immunology theory，complex adaptive system theory and the computational experiment，this paper proposes a theory for the evolution from the antibody of risk recognizer into the antigen of unconventional crisis，and builds a standard system and a model for identification of the affinity of risk identification，the cleanup effect of antigen，the amount and energy of the risk recognizers and so on． It adopts a research idea of identifying sub-unconventional crisis and the syntagmatic relation among various events and its emergency to understand the unconventional crisis infinitely． By computational experiments and illustrative examples，the feasibility is uerified．